Hi Clive, I just noticed your message. So your doctor did test for T4 as well as TSH. Free T4 is the one to observe. The thing is .. if you feel quite well and this reading has shown up I see no reason to start taking medication but as the lab results for free T4 show an anomaly you will be wise to keep an eye on the condition in case it worsens in the future and then you would 'definately' need to take medication to continue to have a good quality of life. So if you research and keep in touch with thyroid matters you will be able to better speak for yourself if that time should come. The thyroxine is a powerful hormone and I know from experience that only 'you' will know when you are taking the 'right' dose. This can be a matter of trial and error .. bumping the medication up or down and obersving the effect it has on you. Too little can leave you fatigued and with a foggy brain. Too much will make you feel aggitated and jittery. It can take weeks to know if the dose you are on is the right one for you. One test that you can do for yourself if you think you are becoming hypothyroid is to take your temperature in the morning before getting out of bed as soon as you wake up. Keep a record. My temperature dropped to 35.1 on my morning readings and I was freezing cold all day long .. I became very, very ill because a doctor dropped my 100mcg Oroxine to 75mcg per day - I now realise that this was a massive drop for me .. it was 1/4 of my daily supply of thyroxine and when I was on my slide down into hypothyroidism the same doctor dismissed my complaints and sent me away with antidepressants. I was virtually at deaths door before I realised what had happened to me. More blood tests were ordered and once again the doctor said 'your results are fine' and gave me a broad smile. My TSH was now 2.4 well within so called 'normal range' and the paperwork was 'perfect for my doctor' but I was sick, sick, sick. My normal happy TSH was 0.08. I took matters into my own hands and put my medication back up to 100mcg and I steadily improved. I feel I have lost a year of my life. Just to clarify why my TSH is normal 'for me' at 0.08 .. in 2010 I had a bowel resection and this has changed my lab results - no doctor has been able to get their head around this fact .. except my surgeon who did the op. and she said the problem stems from absorption issues. She suggested that I might actually have to take a small amount extra of Oroxine. I'm keeping that in mind. Sorry for typing this all in one block I tend to do this when typing in these small boxes Also, do ask for a copy of all your thyroid tests and the tests are best done through the same laboratory each time as each lab have their own ranges. In the meantime be sure you use Iodised salt - the thyroid needs it to work properly, you may need a vitamin D supplement and your ferritin levels may be within range but 'low' this can cause joint pain.
Rosalie